Transformer-case construction.



L. 0. NICHOLS. TRANSFORMER CASE GONSTRUOTION.

APPLIUATION FILED OUT. 19 1905.

Patented Fgb.15,1910. I

M M I; wmm M fix i lTo illicit-omit may concern:

ITED sT T s PA E T ()FFIGE.

H roUI's ojNIC-rrons, 0F nonwoon, onrq-Ass-tenon To THE BULLOCK-ELECTRICMANUFACTURING COMPANY, A CORPORATION or OHIO.

3 TRANSFORMER-CASE CONSTRUCTION.

Specification of Letters latent. PatenteflFebf 15, 1910. Applicationtiled October 19, 1905, Serial no. 253,533.

Elle: it lmownthat I-LOL'IS C.N1cnons,citienoftheln1ted States. residingat Nor.-

wood, in the countyof Hamilton and State 5 of Ohio, have inventedcertainnew and usef'ful- Improvements in .Transformer- Case "Qtiistructionyof which the following is a f,full;'clear and exactspecification.

" My invention relates to transformers and especiallyto casings fortransformers of the lled self-cooling type.

co rr iigate d metal, so as to obtain heat radiatl l l i i l 1 ns formercasings are usually made of.

ling surfacesof sufficient area to dissipate th the heat absorbed bytheoil within the easing Corrugated asings made both of cast etaliand sheetmetalarewell known. Ca t metal casings are objectionable on account oftheirweight andbecause the thickness of the netal pi events closelycorrugated. and

' hence good heat radiating surfaces.

r Sheet metal casings have many advantages over the cast. metal casings,sincemompara I "tivelythin and closely "corrugated sheet metalplates/can be employed. Thus the casingtis light in weight and has alarge 1 heatradiating surfaces Furthermore as thinsheet metal isemployed, heat can easily be conducted from the oil in which thetransformer is immersedtojthe atmosphere surrounding the casing.

is usually composed of a number of sections secured together by fusiblemetal, and this The corrugated wall corrugatcd; wall is attached to abase by lifusible. metal in order to obtain oil-tight joints. It isnecessaryto seal the'joints by 2 fusible metal since the corrugationsprevent the joints .from being rendered Oil-tlgllt' by riveting or-calking or by any other means.

40 The use of fusible metal in" the construction of sree t' metaltransformer casings is a serious objection, for, should the casings besubjected to considerable liea he. fu ible metal would melt and allow anto flow from the casing.

The object of sheet metal transformer casing in which no my invention isto provide a fusible metal is required to obtain oil tight p i Betweenthe plates 12 and 15 is shown 1n joints.

In carrying out my invention I provide a sheet-metal transformer casinghaving a More specifically considered my, invention consists of atransformer casing which coinprises a sheet-metal oil tank havingriveted and calked joints and a surroui'lding water tight corrugatedsheet-metal jacket or cover containing water or bther liquid having ahigh specific heat. K I

My invention still further consists in the details of construction andthe combinations of elements described in the specification am. setforth in the appended claims. 1

For a better uuderstandingof my. invention reference is had to theaccompanying drawings in which; I t

Figure l is a vertical section through the transformer casing, (thetransformer being shown in elevationg) and Fig. 2 is a hori- 'zontalsection of the casing. i The cylindrical portion of my casing consistsof two parts, an inner smooth uncorrugated sheet-metal cylindrical tank10, adapted to hold the oil, and an outer corrugated sheet-metal jacketor' cover 11 adapt-" ed to contain the water or other liquid haw ing ahigher specific heat than the oil. The cylindrical portion, 10 may bemade of a? It single sheet of metal theends'of which are rive-tedtogether, and the joint made oiltight-by calking. The bottom of thecyl-in- 1 vide an oil tight joint.- The cylindeflQ'is-I provided at itstop with theusual cap 13. It

is seen that the oil tank isprovided Wltll joints which can notbe openedby heat. *In order that this tank may hare a largeliefa'tradiatingsurface and hence be self-cooling I surround the oil tank orchamber with the corrugated sheet-metal jacket 11. -The"'- 3 spacesbetween the cylinder 10 and j ackec11,- I fill with water or anyothergood heat conducting fluid having a higher specifi'c'heat than oil. Thejacket 11 may be made ofany number of sections secured together byfuslble metal. I have shown. for convenience only two sections. Thecorrugated portion 11, rests on a plate or base 15 and maybe securedthereto by any easily fusible metal.

or wall 11 is preferably provided with a 5 sheet-metal cap 17. Ifdesired, means such 1 as a valve A may be provided for withdraw ing'thewater from the inclosure between the tank 10 and jacket 11. The entirecaslng and 1 tions which do not depart from the transformer is supportedon a' cast metal base 18. f

'The transformer proper,'c0nsisting of coils 19 and core 20 is mountedon a base 21, which rests on the bottomof the tank. The transformer isadapted to be-surrounded by a cool ng and insulating oil 22'l'as. in thecustomary manner. The heat generated in the transformer will be absorbedby the oil and conveyed to the cylindrical wall 10 which will transmitxthe heat by conduction to the surrounding :water or other heatconveyingfluid of higher specific heat than the oil. The large radiating surfaceof the jacket 11 permits the'heat to be readily dissipated.

I aim in my claims to cover all modificaspirit and' scope of myinvention.

\Vhat I claim as. new and desire, to secure by Letters Patent -is:

1. In combination, a transformer casing comprising a sheet metal tankcontaining oil, a transformer therein, and a surrounding jacket fordissipating the heat, said jacket containing. water. 1

2. In combination, a'transformer casing comprising a sheet metal tankhaving riveted and'calked oints, an oil immersed transformer thereln,and a surrounding acket having a large heat radiatingsurface, saidjacket containing a fluid of higher specific;

' capacity than-the aforesald liquld. 1

heat than the oil. w

3. In combination, 1a. transformer comprising a sheet metal tank forcontaining oil, said tank having riveted and calked joints, an oilimmersed transformer therein, and a corrugated metal jacket surroundingthe tank and containin a fluid of higher specific heat than the Oll.

4. A transformer casing comprising ."a sheet-metal oil tank havingriveted and calked joints, and asurroim'ding Water tight corrugatedsheet-metal jacket or cover con-- taining water. w

5. A transformer casing consisting of a sheet-metal tank having acylindrical body portion and a base plate riveted thereto, the

seam or joint being calked, and a corrugated sheet-metal jacketconsisting of corrugated sections and a base plate, the joints of thejacket being sealed whe'reby water or i other fluid may be retained inthe spaces between the cylindrical tank and the corrugated jacket.

liquid.

immersed having ,the aforesaid llqul 6. In combination, a transformer, acasing. a mclos ng said transformer, sa d casing comprising a tankcontaining a cooling and in-- sulating oil, said tank being formed oismooth or uncorruga ted sheet metal plates having rivet-ed and calkedjoints, and a corrugated sheet metal wall or jacketsurrounding saidtank, the space between the tank and wall being filled with a heatconducting 7. In combination with a receptacle containinga'heat-producin d'evice and a liquid, of .a liquid in which hereceptacle is immersed havinga greater. thermal bapacity than the liquidWithin. the receptacle.

8. The combination with areceptacle con taining a'heat-producingdeviceand a liquid, 1 of another liquid in which the receptacle is a higherspecific heat than 9; The combination with a heat-producing device, aliquid surrounding theisame, and a. receptacle therefor, of a reservoirin which the receptacle is located, and a liquid contained thereinhaving greater specific heat than the. aforesaid liquid. 1 10. Thecombination with a' heat-producing .device, a liquid surroundingthesame, and a receptacle therefor, of a reservoir in -which the receptacleis located, and a liquid contained therein having-a greater thermal11.--,Tl1e combination with a receptacle containing an electricaltranslating device and the receptaclehaving a higher specific heat thanthe insulating liquid. v 13. The combination with areceptacle con-.

taining a' heat-producing device and a liquid, of. substance surroundingthe receptacle that has a greater thermalcapacity than the liquid in thereceptacle.

.QIn testimonv whereof I'aitix my signature,

in the presence of two witnesses.

' LOUIS c. NICHOLS'.- "Witnesses 1 FRED J. KmsEY, ARTH R Fa. KWIs.

l aminsulating' liquid, of a liquid surrounding I,

